Action
Fantasy
Thriller
Happiness takes place in a time in which infectious diseases have become the new normal. In a newly constructed apartment in a large city where the higher floors are up for general sales and the lower floors are rented out, the series depicts the subtle psychological battle and the class discrimination that occurs. The city hits rock bottom when an impending apocalypse hits in the form of a new type of infectious disease in which people suffer from unabated thirst.